... in the game, I mean. These civilians.
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There are faction-specific unit/model files for them, but they all use the same image (except MEX, which uses MEX militia). They're also called "colonists." I know there are other unused units: Bateaux transports, Williams and coffee mill guns, Jayhawkers, even CSA slaves. Not sure what the civvies were supposed to be for in game terms, though, other than cannon fodder. They have stats like very weak, slow-moving infantry. They're extremely cheap (2 money, no WS or conscripts) and fast to produce (5 days). They aren't support units.
The image for them is a little more Wild West than what I think of when Civil War-era colonial fashion is mentioned. Something more like this (from the area of the Dakota War):